Joseph e



(No Model.)

' J. R. HOUSEL.

DENTISTS FLASK.

Patented'mg. `21, 1883.

UNITED STATES PATENT OFFICE.

JOSEPH It. HOUS-EL, OF VATSONTOVVN, ASS-IGNOR TO THE S. S. VHITE DENTALMANUFACTURING COMPANY, OF PHLADELPHHL PA..

' DENTISTS FLASK.

SPECIFICATION forming part of Letters Patent No. 283,487, dated August21, 1883.

Application filed Juliol-1f, 1883. (No model.)

Y T all whom it may concern:

Beit known that I, Josnrn R. HoUsEL, of "Watsontown, in the county ofNorthumberland and State of Pennsylvania, haveinvented certain new anduseful Improvements in Dentists Flasks, of which the following is aspeciiication.

.My invention relates to ilasks more'esp ecially designed for the use ofdentists, and for use with Celluloid, of which artificial dentures areto be made. Celluloid is a well-known material for such dentures. lnmanufacturing artificial dentures from Celluloid, a blank of Celluloidhaving the general form ofthe plate or denture to be made, is placedbetween plaster molds in aask, which have the'desired impression. 'llheflask is then placed in a small stove called a heaten and pressure isapplied to force the mold together on the blank, which, being softenedor rendered plasticby the heat, will take the form of the impression. Ifthe heat is not high enough to make the Celluloid very plastic, agreater amount of pressure is required, and this comes upon the boltsgenerally employed, which pass through the top and bottom plates of therings or sections of the ask, which top and bottom plates overlap saidrings. When aheavy strain is brought upon the plates, they frequentlygive way, as the edges of the plates through which the bolts pass areunsupported, by breaking when made of cast-iron, or by bending when madeof malleable iron or brass. One effect of the heat upon the Celluloid isto cause it to swell and become spongy in cooling if not restrained bythe mold.

The object of my invention is to provide a iiask which will permit anydesired amount/of pressure to be brought upon the bolts and top sectionor ring at the right side of the figure, said section being broken awaynear the iniddle of the liask to show the top edge of the lower flasksection or ring at the lett side of the figure. Fig. 2 is a front viewofthe ask, partly in section, showing the manner of f1tting the parts ofthe iiask together, and showing also the strengthening ribs orprojections, between which the tightening or clamp bolts lie. Fig. 3 isa detached view of the endl of the flask, showing the manner of iittingthe the upper ring of the flask entering an opening in a lug on theupper edge of the lower section or ring thereof, and showing, further,

which the tighteningbolts lie. Fig. 4 is a section through the end ofthe flask, showing the tightening-bolt in position to clamp the flaskparts together, the dotted line showing the ybolt as loose and swungdown to permit the sections of the flask to be separated. Fig. 5 is aplan or topview of the lower or bottom plate of the dash, showing thethickened or raised portions thereon; and Fig. 6 is a view of the lowerflask ring or section inverted, showing the recesses or seats whichreceive the raised or thickened portions on the upper surface of thebottom plate.

The iiask in 'this example is composed of a top ring or section, A, alower ring or section, B, having lugs b, with holes to' receive theusual guide pins or dowels, o, projecting from the lower edge of theupper ring or section, A, a top plate, C, and a bottom plate,r] The topand bottoni plates, C D, overlap or extend beyond the flask-sections A Bto receive the tightening or clamp bolts E, ot' which there are three inthis example, as usual. The heads e of the boltsE in this example areloosely titted in recesses in the projecting edge of the bottom plate,so as to be readily swung down to permit of the opening and closing ofthe flask, as usual. W'hen in their Clamping position, as shown in Figs.1, 2, 3, and 4, the upper ends of the bolts lie in recesses or betweenears on the projecting edge of the top plate, and their threaded endsreceive clamp or screw nuts F, which, when tightened up, obviouslysectionstogether with a guide pin or dowel oi the strengthening ribs orprojections betweenk and bottom plates are liable to give way, bend,

or break at their edges. lTo provide against this I provide theflask-sections A B at their sides with vertical projections, ribs, orflanges a b coincident or in line with each other, fitted to receive thetightening or clamp bolt between them. These ribs or projections a bextend or project outward from the sides of the flasksections, not onlyto 4encompass the bolts, but also to afford extended seats, upon whichthe top and bottom plates rest at the points where the bolts passbetween them. Obviously, th ereyfore, the portions of the top and bottomplates which receive said bolts are rigidly supported, and when pressureis applied by screwing up the clamp-nuts, there is no danger of breakingor bending said plates. To still further strengthen the top and bottomplates, C D, at the points where the bolts pass through and act uponthem, said plates are thickened up at said points by raised portions cd; and these raised or thickened portions are seated in correspondingdepressions or recesses, a2 b2, formed, respectively, in the top andbottom edges of the flask-sections A B. The edges ofthe flasksections AB which fit together are true or smooth to permit a close joint, while,by reason of the recesses or depressions a2 b2, which reeeive thethickened or raised portions e d of the top and bottom plates, a closejoint is`also permitted between the flask-sections and the top and`bottom plates.

I have described my improvements as applicable to the manufacture ofartificial den` tures of celluloid. It will be understood, of course,that they are equally applicable for use in the manufacture of suchdentures from other materials-rubber, for instance-where a great amountof ypressure is required to close the flask in the process of packing.

I claim as my inventionl. The combination of the flask-body, composed ofrings having external strengthening ribs or projections, the separabletop and bottom plates, and the clamp-bolts, substantially as described.y

2. The combination'of thetwo flask-rings having externalstrengthening-ribs, the sep.

arable top and bottom plates having raised or thickened portions fittingcorresponding seats in said flask-rings, and clamp-bolts lying betweensaid strengthening ribs, and passing through said-thickened portionsofthe top and bottom plates, substantially as described.

In testimony whereof I have hereunto subscribed my name this 5th day ofJune, A. D. 1883.

Vitiiesses:

W. W. FIsHER, A. H. CooNnR.-

